A method and apparatus for managing one or more loads powered by an alternating current power source in order to prevent and mitigate overloads and other abnormal conditions of the power source. The management includes monitoring the amount of power supplied to one or more or all loads by the power source and selectively connecting, disconnecting, limiting and controlling various loads which are powered thereby. The method and apparatus include conveying information by use of AC frequency to controllable loads and load control devices, the frequency relating to the amount of power being supplied by the power source, overloading and other power source conditions. The amount of power consumed by the loads is controllable by the loads and load control devices in response to the frequency of the AC power.

A method for calibrating a unit controller with a managing process determining a position of a decoupler mechanism on the pumping unit. The managing process can calibrate the unit controller with a dual pump mode in response to determining the decoupler mechanism is in a coupled position. The managing process can calibrate the unit controller with a single pump mode in response to determining the decoupler mechanism is in a decoupled position with the pumping unit operating with the first fluid end coupled to the power end and the second fluid end decoupled from the power end. The system controller can pump a wellbore treatment fluid in accordance with the pumping unit in i) the dual pump mode or ii) the single pump mode.

A transformer economizer automatically disconnects a main electric power transformer from a grid power line during low-load periods, and automatically reconnects the main transformer to the grid power line during high-load periods, to reduce low-power electricity losses incurred by the main transformer. The main transformer is therefore deenergized and a much smaller auxiliary transformer is energized during low-load periods to reduce the low-power electricity losses incurred by the main transformer. The main transformer is then automatically switched back into service during high-load periods, while the auxiliary transformer is switched out of service. This provides long-term energy, cost, and carbon footprint savings by automatically switching the large transformer's loads to a much smaller auxiliary transformer, and therefore proportionally lower losses, during light-load conditions. Transformer inrush currents are ramped and the secondary voltage remains electrically connected at all times to avoid service interruptions and switching disturbances.

In order to ensure reliable power for charging electric vehicles is available at each charging station at a charging site having multiple charging stations, the systems and methods disclosed herein provide for charge transfers between batteries of such charging stations. A plurality of charging stations at a charging site are connected via local alternating current (AC) circuit in order to transfer energy between the charging stations, such as to balance the energy stored at the respective batteries of the charging stations. Each charging station includes a system controller controlling operation of the charging station and a bidirectional inverter to convert AC input power from a power grid or the local AC circuit to direct current (DC) power for storage in a battery of the charging station and to convert DC power from the battery to AC output power to the local AC circuit, as controlled by the system controller.

In order to suppress frequency fluctuation caused by a load frequency, an AR calculating section calculates an AR using system frequency deviation and tie-line power flow deviation as inputs. An output distribution ratio determining section determines a ratio of output distribution according to merit order based on the AR calculated by the AR calculating section. An output distributing section determines output distribution according to an output change speed based on the output distribution ratio determined by the output distribution ratio determining section according to the output change speed. An output distributing section determines output distribution according to the merit order based on the output distribution ratio determined by the output distribution ratio determining section according to the merit order. An output distribution instruction value determining section determines an output distribution instruction value to each regulated power source using, as inputs, output distribution values determined by the output distributing sections.

A wind power accommodation oriented low-carbon operation scheduling method for offshore oil and gas platform energy system. Aiming at uncertainty and fluctuation of wind power, the method constructs a target linear planning model. A target function result of the model is the lowest power synthesis of a gas generator. Constraints of the model include a gas power generation and wind power synergetic ramp flexibility constraint, a gas generating capacity and wind power capacity synergetic flexibility constraint, an operating characteristic constraint of a gas generator set, an operating characteristic constraint of a gas compressor and a grid-connected operating characteristic constraint of a wind generator. The scheduling method can effectively cope with the uncertainty and fluctuation of wind power, so as to reduce carbon emission of the energy system of the offshore oil and gas field.

A transformer economizer automatically disconnects a main electric power transformer from a grid power line during low-load periods, and automatically reconnects the main transformer to the grid power line during high-load periods, to reduce low-power electricity losses incurred by the main transformer. The main transformer is therefore deenergized and a much smaller auxiliary transformer is energized during low-load periods to reduce the low-power electricity losses incurred by the main transformer. The main transformer is then automatically switched back into service during high-load periods, while the auxiliary transformer is switched out of service. This provides long-term energy, cost, and carbon footprint savings by automatically switching the large transformer's loads to a much smaller auxiliary transformer, and therefore proportionally lower losses, during light-load conditions. Transformer inrush currents are ramped and the secondary voltage remains electrically connected at all times to avoid service interruptions and switching disturbances.

A grid power configuration may provide a reliable, efficient, inexpensive and environmentally conscious power source to a site, for example, a remote site such as a well services environment. Grid power may be provided for one or more operations at the site by coupling a main breaker to a switchgear unit coupled to one or more loads. The switchgear unit may be coupled to the main breaker via a main power distribution unit and may also be coupled to one or more loads. At least one of a grid power unit and a switchgear unit may be coupled to the main breaker via the main power distribution unit and may also be coupled to one or more additional loads. A control center may be communicatively coupled to the main breaker or any one or more other components to control one or more operations of the grid power configuration.

An electronic commuting device for controlling the energy current flow in a wire bidirectionally within an electrical installation, in which the electronic commuting device can be used to supply power from a neutral wire of an electrical installation to a smart home controller device is disclosed, which operates only with a line wire and a load wire, to energize an electrical contact and to supply power to a wireless controller coupled thereto.

The present invention relates to a method for directional transmission of power in the form of energy packets via a transmission network. The power to be transmitted is adjustable at at least one location x of each edge by a data and computer network. A data packet is biuniquely assigned to each energy packet, which data packet is formed in a control instance of the data and computer network by means of predictions. This data packet describes an optimized transport path via which optimized transport path a source transmits the physical power in a fixed transmission period T to a load for partial demand coverage. Furthermore, the data packet describes the power class of the energy packet, wherein this power class is defined by the temporal course of a nominal power P.sub.nom(t) determined by predictions and by a remainder R(t) in the transmission period determined by a function of an uncertainty of the predictions. For the transmission of the energy packet, the transmitted power equal to P.sub.nom(t) plus a fraction of R(t) is set for each point in time t within T at at least one location x of each edge of the transport path.